摘要: Dicription Let D(x) be the number of positive divisors of a positive integer x. For example, D(2) = 2 (2 is divisible by 1 and 2), D(6) = 4 (6 is divi 阅读全文
posted @ 2018-02-03 21:16 蒟蒻JHY 阅读(308) 评论(0) 推荐(0) 编辑